| ER Models | ERM References | ERM Anthologies |
| Model No. | 56 | |||
| Short Citation | (Zhu et al. 1991) | |||
| Year | 1990 | |||
| Special Name | HAMMER (Hierarchical Abstraction Mechanism on Models in ER) | |||
| Descendant of | ||||
| Constructs | Inherent | Entity Type | sg: hyperentity | |
| Relationship Type | sg: min/max-participation, association, aggregation, hierarchy | |||
| Value Sets / Attributes | sg: roles | |||
| New | Invented | Adapted | model, hypermodel | |
| Included | ||||
| Borrowed | Included | |||
| Added | ||||
| Syntactic Rules | (1) Entity types and relationship types are connected to models. (2) Hypermodels are connected to models. | |||
| Semantics | formalized | |||
| Focus | t | |||
| Data Definition | e | |||
| Data Manipulation | ||||
| Remarks | ||||
| Cause | Citation | [HAMMER] grew out of the concerns with the complexities associated with large conceptual models (p. 75) | ||
| Content | Expressiveness | |||
| Applicability | X | |||
| Correction | ||||
| Integration | ||||
| Implementation | ||||
| Other | ||||
| Alternative Publications | ||||
| Binary Vector | Structure/General | [E1] | 1 | |
| [E2] | 1 | |||
| [E3] | i | |||
| [E4] | 1 | |||
| [E5] | ||||
| [E6] | ||||
| Structure/Integrity | [E7] | |||
| [E8] | ||||
| [E9] | 1 | |||
| [E10] | 1 | |||
| [E11] | 1 | |||
| [E12] | 1 | |||
| [E13] | ||||
| [E14] | i | |||
| [E15] | ||||
| [E16] | ||||
| Behavior | [E17] | |||
| [E18] | ||||
| Application | [E19] | |||
| [E20] | ||||
| [E21] | ||||
| [E22] | ||||
| [E23] | ||||
| [E24] | ||||
| [E25] | ||||
| [E26] | ||||
| [E27] | ||||
| Domain-Specifics | [E28] | |||
| [E29] | ||||
| [E30] | ||||
| [E31] | ||||
| [E32] | ||||
| [E33] | ||||
| Expressiveness Values | Total | 0.27 | ||
| Data Model | 0.50 | |||
| Application | 0.00 | |||
| Domain Specifics | 0.00 | |||
| Partially Redundant Constructs | Conjunctive Concepts | S | ||
| Linked Concepts | ||||